package com.qk.filter;

import com.qk.utils.CurrentUserHoler;
import com.qk.utils.JwtUtils;
import io.jsonwebtoken.Claims;
import jakarta.servlet.*;
import jakarta.servlet.annotation.WebFilter;
import jakarta.servlet.http.HttpServletRequest;
import jakarta.servlet.http.HttpServletResponse;
import lombok.extern.slf4j.Slf4j;

import java.io.IOException;

@Slf4j
@WebFilter(urlPatterns = "/*")
public class TokenFilter implements Filter {

    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
        HttpServletRequest request = (HttpServletRequest)servletRequest;
        HttpServletResponse response = (HttpServletResponse)servletResponse;

        //1.获取请求路径
        String uri = request.getRequestURI();  //  /login  /users
        //判断是否为登录请求,如果是,放行
        if (uri.contains("login")){
            log.info("登录请求");
            filterChain.doFilter(request, response);
            return;
        }
        //获取请求头中的token
        String jwt = request.getHeader("token");
        //判断token是否存在,如果不存在,响应401
        if (jwt == null || jwt.isEmpty()){
            log.info("token不存在");
            response.setStatus(401);
            return;
        }
        //解析令牌,如果解析令牌报错,响应401
        try {
            Claims claims = JwtUtils.parseToken(jwt);
            Integer userId = claims.get("id", Integer.class);
            log.info("当前用户Id,存入ThreadLocal");
            CurrentUserHoler.setCurrentUser(userId);
        } catch (Exception e) {
            log.info("令牌解析失败");
            response.setStatus(401);
            return;
        }
        //放行
        log.info("放行");
        filterChain.doFilter(request, response);

        //释放资源
        log.info("删除ThreadLocal中的登录用户信息");
        CurrentUserHoler.removeCurrentUser();

    }
}
